One side of the rectangle is 2 times larger than the other side. Find the area of a rectangle if its perimeter is 84 cm.

In order to find the sides of the rectangle, we compose the equation:
Let x be the width of the rectangle;
Then 2 * x is the length of the rectangle;
We know that the perimeter of the rectangle is 84 cm.We compose an equation of the following form:
x + x + 2 * x + 2 * x = 84;
6 * x = 84;
x = 84: 6;
x = 14.
14 cm – the width of the rectangle;
2 * 14 = 28 cm – the length of the rectangle;
Let’s find the area of ​​the rectangle, for this you need to multiply the width of this rectangle by the value of the length of this rectangle:
14 * 28 = 392 cm2 – the area of ​​this rectangle.
Answer: 392 cm2 is the area of ​​this rectangle.